Best Material Vacuum Casting PMMA

Composition		ISOCYANATE PX 521HT A	POLYOL   PX 522HT B	MIXING
Mixing ratio by weight		100	55
Aspect		liquid	liquid	liquid
Colour		transparent	bluish	transparent*
Viscosity at 25°C                         (mPa.s)	Brookfield LVT	200	1,100	500
Density of parts before mixingDensity of the cured product	ISO 1675: 1985ISO 2781: 1996	1.07-	1.05-	-1.06
Pot life at 25°C on 155g                   (min)	-			5 - 7

*PX 522 is available in orange ( PX 522HT OE Part B) and in red (PX 522HT RD Part B) Vacuum Casting Processing Conditions • Use in a vacuum casting machine. • Heat the mould at 70°C (preferably polyaddition silicon mould). • Heat both parts at 20°C in case of storage at a lower temperature. • Weigh part A in the upper cup (do not forget to allow for residual cup waste). • Weigh part B in the lower cup (mixing cup). • After degasing for 10 minutes under vacuum pour part A in part B and mix for 1 minute 30 to 2 minutes. • Cast in the silicone mould, previously heated at 70°C. • Put in an oven at 70°C minimum. • Demould after 45 minutes at 70°C. • Carry out the following thermal treatment : 3 hr at 70°C + 2 hr at 80°C and 2hr at 100°C. • Always while curing, place the part on stand. Handling Precautions Normal health and safety precautions should be observed when handling these products : • ensure good ventilation • wear gloves and safety glasses For further information, please consult the product safety data sheet.

Flexural modulus	ISO 178 : 2001	MPa	2.100
Flexural strength	ISO 178 : 2001	MPa	105
Tensile modulus	ISO 527 : 1993	MPa	2.700
Tensile strength	ISO 527 : 1993	MPa	75
Elongation at break in tension	ISO 527: 1993	%	9
Charpy impact strength	ISO 179/1 eU : 1994	kJ/m2	27
Final hardness	ISO 868 : 2003	Shore D1	87

Glass temperature transition (Tg)	ISO 11359  : 2002	°C	110
Heat deflection temperature ( HDT 1.8 MPa)	ISO 75 Ae :1993	°C	100
Maximal casting thickness		mm	10
Demoulding time at 70°C (thickness 3 mm)		min.	45

Shelf life of both parts is 12 months in a dry place and in their original unopened containers at a temperature between 15 and 25°C. Any open can must be tightly closed under dry nitrogen.